Process for drying.



I O. W. VOLNEY. PROCESS FOR DRYING. APPLICATION FILED DEO.23,1907.

Patented Jan. 12, 1909.

By h s a l-Harvey;

terial or masses.

UNITED STATES PATENT onnron.

CARL WALTER VOLNEY, 0F KEYPQRT, NEW JERSEY.

PRQGESS FOB Bernie.

Specification of Letters Patent. Application filed. December 23, 1907.Serial No. 107,835.

Patented Jan. 12, 1909.

for Drying, of which the following is a specifieation.

This invention relates to a process or method of treating or removingfrom material of various kinds, other material contained therein, oradherent thereto in the form of liquid or vapor; and has for its objectto provide an improved method or process for this purpose whereby thematerial will be treated me much shorter time and to a higher degree ofdryness, and also in which theliquid orvapor is efiici-ently removed,not al-y t mthe surfa r Qu si e. P r i s. ut fr m. he. in nse er ntertice at he me:

An apparatus for conveniently carrying out my improvedprocess or methodis illustrated in the accompanying drawing, being shown partly insection to set forth the interior construction.

' The process consists broadly in placing the material in a closedvessel, preferably separated'into a number of arts or portions, anddistributed over consi erable area as for instance being placed onshelves. A suitable drying gas is forced into this vessel, preferablyatmospheric air that has been considerably heated. The vessel isprovided with but a single outlet that is alternately opened and closedfor periods of time of considerable duration, while the stream of heatedgas or air is continuously forced into the vessel. Evidently, while thevalve or outlet is closed, the air will accumulate in the vessel and thepressure will increase. Thereupon the valvei:

is opened for a certain period of time, and

the greater portion of e air will find exit through the outlet, untilthe pressure is considerably reduced. Then the valve is again closed,and the pressure permitted to rise again by fresh quantities of theheated air.

The apparatus illustrated in the drawing is shown as comprising a closedreceptacle A be provided with a number -of shelves a. Air is driven intothe vessel A by a suitable ressure device such rs a rotary um or a lowerB that may be drivenby a belt Before passing into'the vessel A the airpasses through a heater 0 whereby its into the drier.

temperature is considerably elevated before passing into the dryingvessel A. The heatmg device C is shown as comprising a tubular boilermember D that may have steam passed into it through an admission pipe Efinding exit through an outlet pipe F. The air passes through the tubes(1 of the boiler which are surrounded by the, steam, and thus the air isconsiderably heated.

The drying vessel A is provided with an outlet opening at M contro ledby a valve m. This valve is opened and closed at periods of considerablelength by any suitable means working automatically, and which arep'refer ably operated from the blower B.- A gear 2 on the blower shaftmeshes with a gear 3 carrying a worm 4, and the latter meshes with aworm wheel 5 on whose shaft is a cam drum 6-. A lever 7 has at one enda, roller ,8, operatingin the cam slot 9 whereby;- the lever is rocked.A lever 10 is pivoted to the valve m and is connected to the lever 7 bya rod 12.

By this means the rotation of the blower shaft will cause the valve tointermittently open and close, the gears and worm wheel causing thevalve to be held open and closed for a considerable period of time.means a continuous flow of air under pressure and considerably heatedwill pass into the drying vessel A. While the valve is closed the airwill accumulate in the vessel and the. pressure will be elevated. As.soon as the valve is opened the air will pass out until the pressure isvery much reduced, whereby the moisture taken up by this heated air fromthe particles of the material will be carried out with the air throughthe valve. The increasing pressure of the air will force it into By thisthe interstices of the material and it will absorb the moisturetherefrom. And when the valve is open, this air will bedriven out notonly by reason of the expansion of the 'air under pressure, butby-reason of the continuous stream of air that is being forced This willinsure a complete change of the air or gas in the drier at each periodthat the valve is opened.

I find by experiment that with such an apparatus an increase of pressureof 40 to 80 mm. can be obtained, and which is very efficient forcarrying on this recess. The re-' ductionof the ressurein the drier whenthe valve is opene will 'tend to dry or suck out the vapor from theinterior of the masses and the continuous current of air will cause suchHaving thus described my invention, I

claim:

1. Theherein' describedprocess or method of drying or removing volatilesubstances from various materials, consisting in placing the material ina closed vessel, and continuously forcing a heated gas into the vessel,and intermittently opening and closing an outlet in the closed vessel atperiods of sufficient duration to considerably elevate the pressure inthe'vessel, and to then restore the pressure a to normal and permitescape of the confined 2. The herein described process or method oftreating or removing volatile substances from various materials,consisting in placing the material in a closed vessel, and continuouslyforcing a heated gas into the vessel under a moderate pressure, andintermittently opening and closing an outlet in the vessel at periods ofsufficient duration to considerably elevate the pressure in the vessel,and to then restore the pressure to normal and permit escape of theconfined gas.

3. The herein described process or method of drying or removing volatilesubstances from various materials, consisting in placing the material ina closed vessel, and continuously forcing a dry heated gas into thevessel, and intermittently opening and closing an outlet in the closedvessel at periods of sulficient duration to a considerably elevate thepressure in the vessel, and to then restore the pressure to normal andpermit escape of the confined gas. A

4. The herein described process or method of drying or removing.volatile substances from various materials, consisting in placing thematerial in a closed vessel, and continuously forcing a dry heated gasinto the vessel,

and intermittently opening and closing an outlet in the closed vessel atequal periods of suflicient duration to considerably elevate thepressure in the vessel, and to then restore the pressure to normal andpermit escape of the confined gas.

5. The herein described process or method of drying or removing volatilesubstances from various materials consisting in placing the material ina closed vessel, continuously forcingatmosphericair first through avessel subjected to heat and thence into the said closed vesselcontaining the material, and intermittently opening and closing anoutlet in the vessel containing the material at-periods of sufficientduration to considerably elevate the pressure in the vessel, and to thenrestore the pressure to normal and permit es-' cape of the confined gas.

6. The herein described process or.method of drying or removing volatilesubstances from various materials consisting in placing the material ina closed vessel, continuously forcing atmospheric air first through avessel subjected to eat and thence into the said closed vesselcontaining the material, and intermittently opening and closing anoutlet in the vessel containing the material at equal periods ofsufficient duration toconsiderably elevate the pressure in the vessel,and to then restore thepressure to normal and permit escape oftheconfined gas. CARL WALTER VOLNEY.

Witnesses:

J. W. KEOUGH, LETTIE ROGERS.

